arch.univariate.distribution.Distribution.ppf¶ abstract Distribution.ppf(pits: float | Sequence[float] | ndarray | Series, parameters: None | Sequence[float] | ndarray | Series = None) → float | ndarray[source]¶ Inverse cumulative density function (ICDF) Parameters:¶ pits: float | Sequence[float] | ndarray | Series¶Probability-integral-transformed values in the interval (0, 1). parameters: None | Sequence[float] | ndarray | Series = None¶Distribution parameters. Use None for parameterless distributions. Returns:¶ i – Inverse CDF values Return type:¶ {float, ndarray}